SPECIFICATION FOR THE CHROMATICITY OF WHITE AND COLOURED LIGHT SOURCES

摘要

A psychophysical experiment was designed in order to evaluate the chromaticity of white and coloured lighting stimuli. Twenty six colour centres were investigated including 16 of them close to MacAdam ellipses. The accumulated data were analysed in terms of fitted ellipses and colour difference evaluation. The uniformity of each colour space was examined and the performance of the related colour difference formulae was evaluated by taking into account the visual data. The colour spaces and formulae examined are the CIELAB, CAM02-UCS, CIELUV (u'v') and xy chromaticity diagram. Among those, the CIELUV (u'v' chromaticity diagram) was shown to outperform the other both in colour space uniformity and predicting perceptual colour difference for the given visual arrangements of lighting stimuli. Finally, the MacAdam data were revisited for verification by using contemporary infrastructure.